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Analytical Tuning Rules for Fractional Order Proportional Integral Controllers
Truong Nguyen Luan Vu,Moonyong Lee 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
A new analytical method based on the fractional calculus and Bode’s ideal transfer function is proposed for the design of fractional-order proportional-integral (FOPI) controllers. On the basis of a first-order-plus-dead-time (FOPDT) process model, the analytical tuning rules are derived by using the frequency domain for achieving the significant improvement in terms of both disturbance rejection and set-point tracking problems. Several illustrative examples are considered to confirm the effectiveness of the proposed algorithm for various dynamic models.
Design of Advanced Multi-loop PI Controller for Multi-delay Processes
Truong Nguyen Luan Vu(트롱부),Moonyong Lee(이문용) 제어로봇시스템학회 2010 제어·로봇·시스템학회 논문지 Vol.16 No.1
An analytical method for robust design of the multi-loop proportional-integral (PI) controller is proposed for various types of multi-delay processes. On the basis of the direct synthesis and generalized IMC-PID approach, the analytical tuning rules of the multi-loop PI controller are firstly derived for achieving the desired closed-loop response, and the structured singular value synthesis is then utilized for the tradeoffs between the robust stability and performance by adjusting only one design parameter (i.e., the closed-loop time constant). To verify the superiority of the proposed method, the simulation studies have been conducted on a wide variety of multivariable processes. The multi-loop PI controller designed by the proposed method shows a fast, well-balanced and robust response with the minimum integral absolute error (IAE) in compared with other renowned methods.
Nonlinear Identification of a Continuous Stirred-Tank Reactor using WSDP Models
Nguyen-Vu Truong 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
This paper presents the application of Wavelet based State Dependent Parameter (WSDP) models to the identification of a Continuous Stirred-Tank Reactor (CSTR). Here, in order to characterize the process dynamics which is highly nonlinear and multi-variable dependent, 2-D WSDP model is used. The simulation results demonstrate the effectiveness and advantages of the identified model.
Nonlinear Identification of a Liquid-saturated Steam Heat Exchanger using WSDP Models
Nguyen-Vu Truong 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
In this paper, nonlinear identification of a Liquidsaturated Steam Heat Exchanger using Wavelet based State Dependent Parameter (WSDP) models is presented. This is a highly nonlinear, non-minimum phase process, and often operated under varying conditions. Here, in order to characterize such dynamics, 2-D WSDP model is used. The simulation results demonstrate the merit of the identified model.
Development of Virtual Control Engineering Experiments
Nguyen-Vu Truong,Ka Wai Lee,Truong-Thinh Nguyen 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
This paper describes the development of a virtual laboratory used as a self-based learning tool for control engineering education at undergraduate level. It relies on real time animation to emulate the operation and connectivity of the physical plant. Here, the real world laboratory plant is mimiced by a 3D-VRML (Virtual Reality Modeling Language) and Cortona Automation interface. This provides a virtually interactive environment which allows users to freely manipulate the virtual plant as if they should be in the real world laboratory environment with the physical hardware.
Analytical Design of Robust Multi-loop PI Controller for Multivariable Processes
Truong Nguyen Luan Vu,Seungtaek Hong,Moonyong Lee 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In this paper, the robust design of the multi-loop PI controller for multivariable processes in the presence of the multiplicative input uncertainty is proposed. The paper deals with two major steps: as a first step, the analytical tuning rules of the multi-loop PI controller are derived from the basis of the generalized IMC-PID approach. Then, in the second step, the robust analysis is utilized for enhancing the robustness of the proposed PI control system. The most important feature of the proposed method is that the tradeoffs between the robust stability and performance can be established by adjusting only one design parameter (i.e., closed-loop time constant) via the structured singular value synthesis. To verify the superiority of the proposed method, two illustrative examples taken from previous works are included. The simulation results demonstrate that the proposed method provides the superior performance over several well-known methods in both nominal and robust cases.
Smith predictor based fractional-order PI control for time-delay processes
Truong Nguyen Luan Vu,이문용 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.8
A new fractional-order proportional-integral controller embedded in a Smith predictor is systematicallyproposed based on fractional calculus and Bode’s ideal transfer function. The analytical tuning rules are first derivedby using the frequency domain for a first-order-plus-dead-time process model, and then are easily applied to variousdynamics, including both the integer-order and fractional-order dynamic processes. The proposed method consistentlyaffords superior closed-loop performance for both servo and regulatory problems, since the design scheme issimple, straightforward, and can be easily implemented in the process industry. A variety of examples are employedto illustrate the simplicity, flexibility, and effectiveness of the proposed SP-FOPI controller in comparison with otherreported controllers in terms of minimum the integral absolute error with a constraint on the maximum sensitivity value.
Analytical Design of Multi-Loop PI Controllers for Interactive Multivariable Processes
Vu, Truong Nguyen Luan,Lee, Moonyong The Society of Chemical Engineers, Japan 2010 Journal of chemical engineering of Japan Vol.43 No.2
<P>In this paper, a simple and efficient design method of multi-loop PI controllers is proposed by extending the Maclaurin series approach to a multi-loop control system. The controller parameter of a multi-loop system is related to that of a SISO non-interacting system with an interaction factor in the simple multiplication form. Based on this relation, analytical tuning rules for a multi-loop PI controller are derived for several representative process models. In order to improve both performance and robustness of the multi-loop control system, the multi-loop Ms criterion is utilized as a performance cost function. The simulation studies confirm the effectiveness of the proposed method.</P>
Design of Extended Simplified Decoupling for Multivariable Processes with Multiple Time Delays
Truong Nguyen Luan Vu,Moonyong Lee 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
In this paper, a simplified decoupling method is proposed for multivariable processes by introducing coefficient matching to obtain a stable, proper, and causal simplified decoupler. Accordingly, transfer functions of decoupled apparent processes can be expressed as a set of n equivalent independent processes and then derived as a ratio of the original open-loop transfer function to the diagonal element of the dynamic relative gain array. The proportional-integral/ proportional-integral derivative (PI/PID) controller is then directly employed to enhance the overall performance of the decoupling control system while avoiding difficulties arising from properties inherent to simplified decoupling. Some simulation studies are considered to demonstrate the simplicity and effectiveness of the proposed method.